Fitness Ball exercises are very effective at targeting those core muscles that are essential for stability and good posture but are often overlooked when exercising with fixed position gym equipment. Core exercises strengthen your abdominal muscles, back muscles and the muscles around the pelvis. It’s also perfect for stretching, balance and stability, training, while helping you tone and trim your entire body. Yoga balls are a key part in helping to develop core strength GlowFit yoga and exercise balls are made from a heavy weight vinyl, providing more stability and rigidity for the most technical moves.